OF NORTHUMBERLAND AND DURHAM. 101 



Pholas dactylus is included in Mr. Winch's list of Lindisfarne 

 shells, and also in Mr. Hogg's " Natural History of the Vicinity 

 of Stockton," on Mr. Winch's authority. In both cases we think 

 Pholas Candida has been mistaken for this species. The Pholas 

 parva of Donovan, mentioned in the latter work, is the young 

 of P. crispata. 



120. XYLOPHAGA, Turton. 

 1. X. DORSALIS, Turt. 



Xylophaga dorsalis, Turt. Brit. Biv. 253, t. 2, f. 4, 5. 

 From an old piece of oak, apparently part of a root, washed up 

 at the mouth of the Tees. — Mr. W. Backhouse. Whitburn. — 

 Rev. G. C. Abbes. 



121. TEREDO, Linnceas. 

 1. T. NoRVEGiOA, Spengler. 



Teredo navalis, Mont. Test. Brit. 527. 

 This species is occasionally met with in the timbers of old 

 ships, but is scarcely native. 



Class. TUNIC ATA, Lamarck.* 



Order. — (Les Ascidies Simples, Milne Edwards. J 



Family. Pelonaiad^, Forbes. 



122 PELONAIA, Forbes and Ooodsir. 



1. P. CORRUOATA, Forh. and Goods. 



Pelonaia corrugatajYorh. and Hani. Brit. Moll, i., 43, t. E.,f. 4. 

 From the fishing boats, Cullercoats, occasionally.—/. A. 



Family. Ascidiad^, Forbes.. _ 

 123. CYNTHIA, Savigny. 

 C. TUBER08A, Macg. ? 



Body irregularly ovate or roundish, pale brown, attached to 

 shells or other marine substances by a broad base : branchial 

 aperture terminal, tubular, much produced and broadly conical 



* By J. Aider and A. Hancock. 



